<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        ul {
            list-style: none;
        }
        ul li:nth-child(2){
            list-style: disc;
        }
    </style>
</head>
<body>
<ul>
    <li>aaa</li>
    <li >bbb</li>
    <li>ccc</li>
</ul>
</body>
</html>